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Thread: Stinking exhaust

  1. #1
    Regular Member bigdave1701's Avatar
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    Default Stinking exhaust

    Got in the car this morning and after about a mile (when I stopped at my sons nursery as the wife opened a back door) I noticed a burning plastic/chemical smell. The wife said its coming from the exhaust so I turned the engine off got out and went for a sniff. between turning the engine off and getting to the exhaust tip the smell had almost gone completely. Started the engine again and drove to work and the smell was back. Again by the time I got to the back of the car the smell had almost gone.

    A visual inspection of the engine & exhaust reveals nothing. Ive checked the brakes and thyre not bound on. Any ideas?

    *EDIT*
    There's only 10 miles left in the tank if that has any relevance.
    Last edited by bigdave1701; 6th February 2012 at 20:43.

  2. #2
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

    Default

    Could be cat failing Although its usually an eggy smell

  3. #3
    Regular Member MrDerv's Avatar
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    Quote Originally Posted by Critch View Post
    Could be cat failing Although its usually an eggy smell
    It would only smell eggy on a petrol engine

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    Regular Member m8internet's Avatar
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    More than likely the smell is being ventilated into the passenger compartment from the engine bay

    Check the condition of the pollen filter

    With the engine running and bonnet up check for smells from the engine bay, then compare within the car
    Lower the bonnet, allow a few minutes to pass then compare

    Does you car have rear seat vents?
    If so, close these and compare

  5. #5
    Regular Member the_riddler's Avatar
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    Have you checked your coolant level??
    Some times early stages of headgasket going can smell a little like chemicals if the anti freeze is coming through the exhaust!

  6. #6
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

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    Quote Originally Posted by MrDerv View Post
    It would only smell eggy on a petrol engine
    Fair enough

  7. #7
    Regular Member bigdave1701's Avatar
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    There's been a bit of a warm coolant smell in the cabin for a while but it's not losing coolant. The smell is only really noticeable when stationery with a window or door open.

    *EDIT*
    Pollen filter was new 7 months ago. I checked the scuttle last week and it's clear.

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    Quote Originally Posted by MrDerv View Post
    It would only smell eggy on a petrol engine

    Yeah it would have a vegetable oil smell about it.

  9. #9
    Regular Member TonyP2020's Avatar
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    It could also be a plastic bag burnt onto the exhaust.
    That gives a burning plastic smell.
    It could also be the DPF burning off the soot in it, that gets the exhaust really hot.

  10. #10
    Regular Member the_riddler's Avatar
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    Quote Originally Posted by bigdave1701 View Post
    There's been a bit of a warm coolant smell in the cabin for a while but it's not losing coolant. The smell is only really noticeable when stationery with a window or door open.
    I might be inclined to see if you can get a pressure test done on the coolant see if there is any exhaust gas presurisng the coolant system.

    It could be going the other way and pushing a little exhaust gas out of the headertank overflow causing the smell etc! You tend to find most smells at the back of the car in the end due to the fact you travel forwards most lol!!

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